Compact folded waveguides

A folded waveguide structure is presented farmed from microwave laminates as a space saving alternative of the rectangular waveguide. It is shown that the folded waveguide results in a width reduction of ε _r ^-1/2 /2 over standard air filled rectangular waveguide making integrated waveguide viable at low microwave frequencies. Via hole technology is used to manufacture this design, at low cost, using computer controlled drilling machines. The guide is integrated to planar circuitry using tapered stripline.